The Srimad-Bhagavatam is considered the topmost collection of all ancient wisdom. It contains histories of the many incarnations and activities of Krishna throughout human history. It was written by the author of the Vedas, Vyasadeva, as his own commentary on Vedanta-sutra, the essence of all spiritual knowledge.
Srimad-Bhagavatam is also known as the Bhagavat Purana, one of the eighteen Puranas (ancient histories) in the Vedic tradition. Its eighteen thousand verses are presented in twelve cantos, each of which deals with a specific aspect of transcendental knowledge. The main theme running throughout the Bhagavatam is the science and practice of bhakti-yoga, devotional service to the Supreme Person.